nRF52840 QSPI Enable and Disable

[sunbing]

Hi,

Would like to understand when will be the chip select pin be asserted and de-asserted when reading/writing a QSPI external flash? 

What will enabling QSPI by setting ENABLE register do? Manual mentioned it will turn on QSPI peripheral and acquire pins configured, will it assert the chip select?

Thanks.

[sunbing]

any update?